Where is the computer in a 1993 Chevy conversion van?

There wouldn't be a computer in a 1993 Chevy conversion van in the same way a modern car has one. 1993 vehicles didn't have the sophisticated onboard computers that control so many functions today. While there might be some simple electronic control modules (ECMs) for things like the fuel injection system, these are not what we typically think of as a "computer". They were much simpler and less powerful than modern car computers. They wouldn't be located in a readily accessible or user-friendly place, but rather tucked away within the engine compartment or under the dashboard.